import sys



# 引用计数
# print(sys.getrefcount(9745498213569844112))
# i = 9745498213569844112
# print(sys.getrefcount(9745498213569844112))
# j = i
# del i
# print(sys.getrefcount(9745498213569844112))
#
#
# def fun(a):
# 	print(a, sys.getrefcount(9745498213569844112))
#
# fun(j)
#
# print(sys.getrefcount(9745498213569844112))
# del  j
# print(sys.getrefcount(9745498213569844112))
#

# a0 = [1,3,5]
# a = a0
# print(sys.getrefcount(a0))
# b0 = [2,4,6]
# b = b0
# print(sys.getrefcount(b0))
# a0.append(b0)
# print(sys.getrefcount(b0))
# b0.append(a0)
# print(sys.getrefcount(a0))
# del  a
# del b
# print(sys.getrefcount(a0))
# print(sys.getrefcount(b0))


